Mechanical properties of sintered Fe-Ni-P alloys prepared with plated powder.

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Abstract
Mechanical properties of Fe-Ni-P alloys sintered by using atomized iron powder electroless plated with nickel-phosphorus alloy were studied. The sintered alloys with plated powder showed higher tensile strength and larger elongation than those of sintered alloys with mixed powders. The microstructure of the sintered alloys showed a composite structure consisted of two regions. The one is the intergranular region contained smaller iron particles, where nickel content is higher, forming a kind of skeleton in the sintered alloy. The other is the inside region of larger iron particles where iron remains low alloyed after sintering. This composite structure gives the high tensile strength and the large ductility of Fe-Ni-P alloys sintered with plated powder. The relationship between the tensile strength and the content of nickel and phosphorous (in mass%) of sintered Fe-Ni-P alloys with plated powder was represented by the following empirical equation.σ=24.2(Ni+10P)+218 [MPa]